diff --git a/go.mod b/go.mod
index 1a63ffb..4b444b4 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,6 @@ require (
 	github.com/fsnotify/fsnotify v1.4.2
 	github.com/gorilla/feeds v0.0.0-20160207162205-441264de03a8
 	github.com/russross/blackfriday v0.0.0-20151110051855-0b647d0506a6
-	github.com/shurcooL/sanitized_anchor_name v0.0.0-20151028001915-10ef21a441db
-	github.com/ylih/extrasys v0.0.0-20160406221357-48c6a025836d
+	github.com/shurcooL/sanitized_anchor_name v0.0.0-20151028001915-10ef21a441db // indirect
 	golang.org/x/sys v0.0.0-20181011152604-fa43e7bc11ba // indirect
 )
diff --git a/go.sum b/go.sum
index 606a42e..db08547 100644
--- a/go.sum
+++ b/go.sum
@@ -6,6 +6,5 @@ github.com/russross/blackfriday v0.0.0-20151110051855-0b647d0506a6 h1:NCdCpzq6sA
 github.com/russross/blackfriday v0.0.0-20151110051855-0b647d0506a6/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
 github.com/shurcooL/sanitized_anchor_name v0.0.0-20151028001915-10ef21a441db h1:lrOUn8raSZS/V52c7elGaEyuogqSkEo/Qj2Auo2G1ik=
 github.com/shurcooL/sanitized_anchor_name v0.0.0-20151028001915-10ef21a441db/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
-github.com/ylih/extrasys v0.0.0-20160406221357-48c6a025836d/go.mod h1:aD4duGmmbfFyJHIIpIU6fozqe9OSHyRVwOeR304M7t0=
 golang.org/x/sys v0.0.0-20181011152604-fa43e7bc11ba h1:nZJIJPGow0Kf9bU9QTc1U6OXbs/7Hu4e+cNv+hxH+Zc=
 golang.org/x/sys v0.0.0-20181011152604-fa43e7bc11ba/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=